Step 1 : Introduction to the question "4. Sometimes mirrors are just for fun. What is the name for a tube containing several mirrors and (usually) some loose brightly-colored objects which form changing patterns when held to the eye while the tube is rotated?"
...1. Viewfinder 2. Microscope 3. Kaleidoscope 4. Telescope The word kaleidoscope comes from Greek words which translate literally as 'observer of beautiful shapes'. Sir David Brewster invented the device in 1816, during research into polarized light, and expected it to be a serious scientific tool, but it was quickly turned into a children's toy. The long main tube contains several mirrors along its length, set at angles to produce multiple reflections of the objects; the pattern depends on the number of mirrors used and the angle between them. As the tube is rotated, the loose colored objects fall into different positions, producing an ever-changing pattern. Some kaleidoscopes simply have mirrors, producing a pattern based on reflections of the external environment.
Step 2 : Answer to the question "4. Sometimes mirrors are just for fun. What is the name for a tube containing several mirrors and (usually) some loose brightly-colored objects which form changing patterns when held to the eye while the tube is rotated?"
Kaleidoscope:
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